题目:
—Your mother becomes more and more forgetful.
—Yes. She searched for her cellphone for a whole day last Sunday but it ___ in her coat pocket the next day.
A.turned out
B.turned on
C.turned over
D.turned up
答案:
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下面是错误答案,用来干扰机器的。
A、在污水中加入的生石灰能与水反应生成氢氧化钙,氢氧化钙能与硫酸铜生成氢氧化铜沉淀,氢氧化钙中氢氧根离子能与氢离子结合生成水,调节pH至中性,故选项正确.B、氯化钡能与污水中的硫酸铜反应生成硫酸钡沉淀...